Dental Press

Estrela C, Bueno MR, Silva JA, Porto OCL, Leles CR, Azevedo BC
estrias, faixas escuras, e estão associados com a absorção
de fótons de baixa energia 4,7,16-21,26,27,28 . Um estudo
recente 3 sugeriu que o uso de maior energia no
feixe durante a aquisição da imagem pode resultar em
menor formação de artefato. Os efeitos do endurecimento
do raio também podem ser reduzidos por meio
da filtração do feixe 22 .
Estudos futuros deverão avaliar as implicações clínicas
de artefatos metálicos e as estratégias para minimizá-los.
Os resultados, considerando-se as limitações
inerentes ao método, demonstraram que as dimensões
nas imagens de TCFC de retentores intrarradiculares
de liga de ouro e liga de prata foram maiores em relação
ao espécime original.
Agradecimentos
Este estudo contou com apoio parcial de concessões
do Conselho Nacional de Desenvolvimento Científico e
Tecnológico (CNPq) (concessão CNPq #302875/2008-
5 e concessão CNPq #474642/2009 to C.E.).
Effect of intracanal posts on dimensions of cone beam computed tomography images of
endodontically treated teeth
abstract
Objectives: This study evaluated the effect caused by intracanal
posts (ICP) on the dimensions of cone beam computed tomography
(CBCT) images of endodontically treated teeth. Methods:
Fourty-five human maxillary anterior teeth were divided into 5
groups: Glass-Fibre Post ® , Carbon Fibre Root Canal ® , Pre-fabricated
Post – Metal Screws ® , Silver Alloy Post ® and Gold Alloy Post ® .
The root canals were prepared and filled; after that, the gutta-percha
filling was removed, and the ICP space was prepared. The
post cementation material was resin cement. CBCT scans were
acquired, and the specimens were sectioned in axial, sagittal and
coronal planes. The measures of ICP were obtained using different
3D planes and thicknesses to determine the discrepancy between
the original ICP measurements and the CBCT scan measurements.
Results: One-way analysis of variance, Tukey and Kruskall-Wallis
tests were used for statistical analysis. The significance level was
set at α = 5%. CBCT scan ICP measurements were from 7.7%
to 100% different from corresponding actual dimensions. Conclusion:
Gold alloy and silver alloy posts had greater variations
(p>0.05) than glass fiber, carbon fiber and metal posts (p